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        <h1 class="title">Java web:JSP Model</h1>
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                <time datetime="2019-05-05T22:11:44.000Z" itemprop="datePublished" class="page-time">
  2019-05-05
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            <ol class="post-toc"><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#学习笔记-Java-web之JSP-开发模型"><span class="post-toc-number">1.</span> <span class="post-toc-text">学习笔记 : Java web之JSP 开发模型</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#JSP-Model1"><span class="post-toc-number">1.1.</span> <span class="post-toc-text">JSP Model1</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#JSP-Model1-案例"><span class="post-toc-number">1.1.1.</span> <span class="post-toc-text">JSP Model1 案例</span></a></li></ol></li><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#JSP-Model2"><span class="post-toc-number">1.2.</span> <span class="post-toc-text">JSP Model2</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-4"><a class="post-toc-link" href="#JSP-Model2-案例"><span class="post-toc-number">1.2.1.</span> <span class="post-toc-text">JSP Model2 案例</span></a></li></ol></li></ol></li></ol>
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        <h1 class="post-card-title">Java web:JSP Model</h1>
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            <time class="post-time" title="2019-05-05 22:11:44" datetime="2019-05-05T22:11:44.000Z"  itemprop="datePublished">2019-05-05</time>

            


            

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            <h2 id="学习笔记-Java-web之JSP-开发模型"><a href="#学习笔记-Java-web之JSP-开发模型" class="headerlink" title="学习笔记 : Java web之JSP 开发模型"></a>学习笔记 : Java web之JSP 开发模型</h2><h3 id="JSP-Model1"><a href="#JSP-Model1" class="headerlink" title="JSP Model1"></a>JSP Model1</h3><p><em>简介 : <code>JSP Model1</code>采用JSP+JavaBean的技术,将页面显示和业务逻辑分开.其中,JSP实现流程控制和页面显示,JavaBean对象封装数据和业务逻辑.这种设计实现了数据,业务逻辑和页面显示的分离,在一定程度上实现了程序开发的模块化,降低了程序修改和维护的难度.</em></p>
<h4 id="JSP-Model1-案例"><a href="#JSP-Model1-案例" class="headerlink" title="JSP Model1 案例"></a>JSP Model1 案例</h4><p><em>案例描述 : 通过一个简单的网络计算器程序来深化对JSP Model1模型的理解.</em></p>
<ol>
<li><p><em>Calculator.java : 封装计算器中的数据,处理业务逻辑.</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.jspmodel.model1.calculator;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.math.BigDecimal;</span><br><span class="line"><span class="keyword">import</span> java.util.HashMap;</span><br><span class="line"><span class="keyword">import</span> java.util.Map;</span><br><span class="line"><span class="keyword">import</span> java.util.regex.Pattern;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@ClassName</span>: Calculator</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span>: 封装计算器中的数据及处理业务逻辑</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: HuangYuhui</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: May 5, 2019 10:10:43 AM</span></span><br><span class="line"><span class="comment"> * </span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Calculator</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">private</span> <span class="keyword">char</span> operator;</span><br><span class="line">	<span class="keyword">private</span> String firstNumber;</span><br><span class="line">	<span class="keyword">private</span> String secondNumber;</span><br><span class="line">	<span class="keyword">private</span> Map&lt;String, String&gt; errors = <span class="keyword">new</span> HashMap&lt;String, String&gt;();<span class="comment">// 封装错误信息</span></span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">getFirstNumber</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> firstNumber;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setFirstNumber</span><span class="params">(String firstNumber)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.firstNumber = firstNumber;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">getSecondNumber</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> secondNumber;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setSecondNumber</span><span class="params">(String secondNumber)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.secondNumber = secondNumber;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">char</span> <span class="title">getOperator</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> operator;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setOperator</span><span class="params">(<span class="keyword">char</span> operator)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.operator = operator;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> Map&lt;String, String&gt; <span class="title">getErrors</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> errors;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setErrors</span><span class="params">(Map&lt;String, String&gt; errors)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.errors = errors;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="comment">// 运算操作</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">caculate</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		BigDecimal result = <span class="keyword">null</span>;</span><br><span class="line">		BigDecimal firstNum = <span class="keyword">new</span> BigDecimal(firstNumber);</span><br><span class="line">		BigDecimal secondNum = <span class="keyword">new</span> BigDecimal(secondNumber);</span><br><span class="line"></span><br><span class="line">		<span class="keyword">switch</span> (operator) &#123;</span><br><span class="line">		<span class="keyword">case</span> <span class="string">'+'</span>:</span><br><span class="line">			result = firstNum.add(secondNum);</span><br><span class="line">			<span class="keyword">break</span>;</span><br><span class="line">		<span class="keyword">case</span> <span class="string">'-'</span>:</span><br><span class="line">			result = firstNum.subtract(secondNum);</span><br><span class="line">			<span class="keyword">break</span>;</span><br><span class="line">		<span class="keyword">case</span> <span class="string">'*'</span>:</span><br><span class="line">			result = firstNum.multiply(secondNum);</span><br><span class="line">			<span class="keyword">break</span>;</span><br><span class="line">		<span class="keyword">case</span> <span class="string">'/'</span>:</span><br><span class="line">			<span class="keyword">if</span> (<span class="string">"0"</span>.equals(secondNumber)) &#123;</span><br><span class="line">				<span class="comment">// throw new RuntimeException("除数不能为 0 !");</span></span><br><span class="line">				<span class="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line">			&#125;</span><br><span class="line">			result = firstNum.divide(secondNum);</span><br><span class="line">			<span class="keyword">break</span>;</span><br><span class="line"></span><br><span class="line">		<span class="keyword">default</span>:</span><br><span class="line">			<span class="keyword">break</span>;</span><br><span class="line">		&#125;</span><br><span class="line"></span><br><span class="line">		<span class="keyword">return</span> result.toString();</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="comment">// 验证表单传入的数据是否合法</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">validate</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">boolean</span> flag = <span class="keyword">true</span>;</span><br><span class="line">		Pattern pattern = Pattern.compile(<span class="string">"\\d+"</span>);<span class="comment">// 匹配数字</span></span><br><span class="line">		<span class="keyword">if</span> (firstNumber == <span class="keyword">null</span> || <span class="string">""</span>.equals(firstNumber)) &#123;</span><br><span class="line">			errors.put(<span class="string">"firstNumberErrorInfo"</span>, <span class="string">"第一个运算数不能为空 !"</span>);</span><br><span class="line">			flag = <span class="keyword">false</span>;</span><br><span class="line">		&#125; <span class="keyword">else</span> <span class="keyword">if</span> (!pattern.matcher(firstNumber).matches()) &#123;</span><br><span class="line">			errors.put(<span class="string">"firstNumberErrorInfo"</span>, <span class="string">"第一个运算数必须为数字 !"</span>);</span><br><span class="line">			flag = <span class="keyword">false</span>;</span><br><span class="line">		&#125;</span><br><span class="line"></span><br><span class="line">		<span class="keyword">if</span> (secondNumber == <span class="keyword">null</span> || <span class="string">""</span>.equals(secondNumber)) &#123;</span><br><span class="line">			errors.put(<span class="string">"secondNumberErrorInfo"</span>, <span class="string">"第二个运算数不能为空 !"</span>);</span><br><span class="line">			flag = <span class="keyword">false</span>;</span><br><span class="line">		&#125; <span class="keyword">else</span> <span class="keyword">if</span> (!pattern.matcher(secondNumber).matches()) &#123;</span><br><span class="line">			errors.put(<span class="string">"secondNumberErrorInfo"</span>, <span class="string">"第二个运算数必须为数字 !"</span>);</span><br><span class="line">			flag = <span class="keyword">false</span>;</span><br><span class="line">		&#125; <span class="keyword">else</span> <span class="keyword">if</span> (<span class="string">"0"</span>.equals(secondNumber)) &#123;</span><br><span class="line">			errors.put(<span class="string">"secondNumberErrorInfo"</span>, <span class="string">"被除数不能为 0 !"</span>);</span><br><span class="line">			flag = <span class="keyword">false</span>;</span><br><span class="line">		&#125;</span><br><span class="line"></span><br><span class="line">		<span class="keyword">return</span> flag;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>calculator.jsp : 显示网络计算机的页面.</em></p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">%@</span> <span class="attr">page</span> <span class="attr">language</span>=<span class="string">"java"</span> <span class="attr">contentType</span>=<span class="string">"text/html; charset=UTF-8"</span> <span class="attr">pageEncoding</span>=<span class="string">"UTF-8"</span> <span class="attr">import</span>=<span class="string">"java.util.Map"</span>%&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">jsp:useBean</span> <span class="attr">id</span>=<span class="string">"calculator"</span> <span class="attr">class</span>=<span class="string">"pers.huangyuhui.jspmodel.model1.calculator.Calculator"</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">jsp:setProperty</span> <span class="attr">property</span>=<span class="string">"*"</span> <span class="attr">name</span>=<span class="string">"calculator"</span>/&gt;</span></span><br><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"UTF-8"</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">title</span>&gt;</span>JSP Model 1<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">style</span>&gt;</span></span><br><span class="line">			span&#123;</span><br><span class="line"><span class="css">				<span class="selector-tag">font-size</span><span class="selector-pseudo">:13px</span>;</span></span><br><span class="line"><span class="css">				<span class="selector-tag">color</span><span class="selector-pseudo">:red</span>;</span></span><br><span class="line">			&#125;</span><br><span class="line"><span class="css">			<span class="selector-id">#main</span>&#123;</span></span><br><span class="line"><span class="css">				<span class="selector-tag">width</span><span class="selector-pseudo">:600px</span>;</span></span><br><span class="line">				margin-left: 425px;</span><br><span class="line">			&#125;</span><br><span class="line"><span class="css">			<span class="selector-id">#main</span> <span class="selector-tag">tr</span>&#123;</span></span><br><span class="line"><span class="css">				<span class="selector-tag">height</span><span class="selector-pseudo">:40px</span>;</span></span><br><span class="line">			&#125;</span><br><span class="line"><span class="css">			<span class="selector-id">#main</span> <span class="selector-tag">tr</span> <span class="selector-tag">td</span>&#123;</span></span><br><span class="line">				width: 50px;</span><br><span class="line">			&#125;</span><br><span class="line"><span class="css">			<span class="selector-id">#main</span> <span class="selector-tag">tr</span> <span class="selector-tag">td</span> <span class="selector-tag">input</span>&#123;</span></span><br><span class="line">				width: 200px;</span><br><span class="line">			&#125;</span><br><span class="line"><span class="css">			<span class="selector-class">.buttom</span> &#123;</span></span><br><span class="line">				text-align: center;</span><br><span class="line">				padding-top: 25px;</span><br><span class="line">			&#125;</span><br><span class="line"><span class="css">			<span class="selector-class">.buttom</span> <span class="selector-class">.calculate</span>&#123;</span></span><br><span class="line">				margin-right: 65px;</span><br><span class="line">			&#125;</span><br><span class="line">		<span class="tag">&lt;/<span class="name">style</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">h3</span> <span class="attr">align</span>=<span class="string">"center"</span>&gt;</span>JSP Mode 1 : 计算器<span class="tag">&lt;/<span class="name">h3</span>&gt;</span><span class="tag">&lt;<span class="name">hr</span>/&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">form</span> <span class="attr">action</span>=<span class="string">""</span> <span class="attr">method</span>=<span class="string">"post"</span>&gt;</span></span><br><span class="line">				<span class="tag">&lt;<span class="name">table</span> <span class="attr">id</span>=<span class="string">"main"</span>&gt;</span></span><br><span class="line">					<span class="tag">&lt;<span class="name">tr</span>&gt;</span></span><br><span class="line">						<span class="tag">&lt;<span class="name">td</span>&gt;</span>	第一个运算数<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">						<span class="tag">&lt;<span class="name">td</span> &gt;</span></span><br><span class="line">							<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">name</span>=<span class="string">"firstNumber"</span>/&gt;</span></span><br><span class="line">							<span class="tag">&lt;<span class="name">span</span>&gt;</span>$&#123;errors.firstNumberErrorInfo &#125;<span class="tag">&lt;/<span class="name">span</span>&gt;</span></span><br><span class="line">						<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">					<span class="tag">&lt;/<span class="name">tr</span>&gt;</span></span><br><span class="line">					<span class="tag">&lt;<span class="name">tr</span>&gt;</span></span><br><span class="line">						<span class="tag">&lt;<span class="name">td</span>&gt;</span>	运算符<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">						<span class="tag">&lt;<span class="name">td</span>&gt;</span></span><br><span class="line">							<span class="tag">&lt;<span class="name">select</span> <span class="attr">name</span>=<span class="string">"operator"</span> <span class="attr">style</span>=<span class="string">"margin-left:65px"</span>&gt;</span></span><br><span class="line">								<span class="tag">&lt;<span class="name">option</span> <span class="attr">value</span>=<span class="string">"+"</span>&gt;</span>+<span class="tag">&lt;/<span class="name">option</span>&gt;</span></span><br><span class="line">								<span class="tag">&lt;<span class="name">option</span> <span class="attr">value</span>=<span class="string">"-"</span>&gt;</span>-<span class="tag">&lt;/<span class="name">option</span>&gt;</span></span><br><span class="line">								<span class="tag">&lt;<span class="name">option</span> <span class="attr">value</span>=<span class="string">"*"</span>&gt;</span>*<span class="tag">&lt;/<span class="name">option</span>&gt;</span></span><br><span class="line">								<span class="tag">&lt;<span class="name">option</span> <span class="attr">value</span>=<span class="string">"/"</span>&gt;</span>/<span class="tag">&lt;/<span class="name">option</span>&gt;</span></span><br><span class="line">							<span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br><span class="line">						<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">					<span class="tag">&lt;/<span class="name">tr</span>&gt;</span></span><br><span class="line">					<span class="tag">&lt;<span class="name">tr</span>&gt;</span></span><br><span class="line">						<span class="tag">&lt;<span class="name">td</span>&gt;</span>第二个运算符<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">						<span class="tag">&lt;<span class="name">td</span>&gt;</span></span><br><span class="line">							<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">name</span>=<span class="string">"secondNumber"</span>/&gt;</span></span><br><span class="line">							<span class="tag">&lt;<span class="name">span</span>&gt;</span>$&#123;errors.secondNumberErrorInfo &#125;<span class="tag">&lt;/<span class="name">span</span>&gt;</span></span><br><span class="line">						<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">					<span class="tag">&lt;/<span class="name">tr</span>&gt;</span></span><br><span class="line">					<span class="tag">&lt;<span class="name">tr</span>&gt;</span></span><br><span class="line">						<span class="tag">&lt;<span class="name">td</span>&gt;</span>运算结果: <span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">						<span class="tag">&lt;<span class="name">td</span>&gt;</span></span><br><span class="line">							<span class="tag">&lt;<span class="name">%</span></span></span><br><span class="line">								Map&lt;String,String&gt; errorInfo = calculator.getErrors();</span><br><span class="line">								if(calculator.validate())&#123;</span><br><span class="line">									pageContext.getSession().removeAttribute("errors");</span><br><span class="line">							%&gt;</span><br><span class="line">							<span class="tag">&lt;<span class="name">font</span> <span class="attr">color</span>=<span class="string">"green"</span>&gt;</span></span><br><span class="line">								<span class="tag">&lt;<span class="name">jsp:getProperty</span> <span class="attr">property</span>=<span class="string">"firstNumber"</span> <span class="attr">name</span>=<span class="string">"calculator"</span>/&gt;</span></span><br><span class="line">								<span class="tag">&lt;<span class="name">jsp:getProperty</span> <span class="attr">property</span>=<span class="string">"operator"</span> <span class="attr">name</span>=<span class="string">"calculator"</span>/&gt;</span></span><br><span class="line">								<span class="tag">&lt;<span class="name">jsp:getProperty</span> <span class="attr">property</span>=<span class="string">"secondNumber"</span> <span class="attr">name</span>=<span class="string">"calculator"</span>/&gt;</span></span><br><span class="line">								= <span class="tag">&lt;<span class="name">%=calculator.caculate()</span> %&gt;</span></span><br><span class="line">							<span class="tag">&lt;<span class="name">%</span></span></span><br><span class="line"><span class="tag">								&#125;<span class="attr">else</span>&#123;</span></span><br><span class="line"><span class="tag">									<span class="attr">pageContext.getSession</span>()<span class="attr">.setAttribute</span>("<span class="attr">errors</span>",<span class="attr">errorInfo</span>);</span></span><br><span class="line"><span class="tag">								&#125;</span></span><br><span class="line"><span class="tag">							%&gt;</span></span><br><span class="line">							<span class="tag">&lt;/<span class="name">font</span>&gt;</span></span><br><span class="line">						<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">					<span class="tag">&lt;/<span class="name">tr</span>&gt;</span></span><br><span class="line">				<span class="tag">&lt;/<span class="name">table</span>&gt;</span></span><br><span class="line">				<span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">"buttom"</span>&gt;</span></span><br><span class="line">					<span class="tag">&lt;<span class="name">input</span> <span class="attr">class</span>=<span class="string">"calculate"</span> <span class="attr">type</span>=<span class="string">"submit"</span> <span class="attr">value</span>=<span class="string">"计算"</span>/&gt;</span></span><br><span class="line">					<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"reset"</span> <span class="attr">value</span>=<span class="string">"重置"</span>/&gt;</span></span><br><span class="line">				<span class="tag">&lt;/<span class="name">div</span>&gt;</span>		</span><br><span class="line">			<span class="tag">&lt;/<span class="name">form</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>程序运行效果示例图.</em></p>
<figure class="image-bubble">
                <div class="img-lightbox">
                    <div class="overlay"></div>
                    <img src="/2019/05/05/Java-web-JSP-Model/JSPModel1案例-计算器页面.PNG" alt title>
                </div>
                <div class="image-caption"></div>
            </figure>
</li>
</ol>
<h3 id="JSP-Model2"><a href="#JSP-Model2" class="headerlink" title="JSP Model2"></a>JSP Model2</h3><p><em>简介 : <code>JSP Model2</code>架构模型采用JSP+Servlet+JavaBean技术,其将<code>JSP Model1</code>中JSP页面里的流程控制代码提取出来.封装到Servlet中,从而实现了整个程序页面显示,流程控制和业务逻辑的分离.实际上JSP Model2就是<code>MVC</code>设计模式,其中控制器(<code>Colltroller</code>)的角色由Servlet实现,视图(<code>View</code>)的角色由JSP实现,模型(<code>Model</code>)的角色由JavaBean实现.</em></p>
<h4 id="JSP-Model2-案例"><a href="#JSP-Model2-案例" class="headerlink" title="JSP Model2 案例"></a>JSP Model2 案例</h4><p><em>案例描述 : 按照<code>JSP Model2</code>的模型思想编写一个用户注册的简单示例程序.</em></p>
<ol>
<li><p><em>UserBean.java : 封装用户的注册信息.</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.jspmodel.model2.register;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@ClassName</span>: UserBean</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span>: 封装用户注册信息</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: HuangYuhui</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: May 5, 2019 4:35:21 PM</span></span><br><span class="line"><span class="comment"> * </span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UserBean</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">private</span> String name;</span><br><span class="line">	<span class="keyword">private</span> String password;</span><br><span class="line">	<span class="keyword">private</span> String email;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="title">UserBean</span><span class="params">(String name, String password, String email)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">super</span>();</span><br><span class="line">		<span class="keyword">this</span>.name = name;</span><br><span class="line">		<span class="keyword">this</span>.password = password;</span><br><span class="line">		<span class="keyword">this</span>.email = email;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">getName</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> name;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setName</span><span class="params">(String name)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.name = name;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">getPassword</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> password;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setPassword</span><span class="params">(String password)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.password = password;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">getEmail</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> email;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setEmail</span><span class="params">(String email)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.email = email;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>RegisterFormBean.java : 封装并效验注册表单信息的JavaBean.</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.jspmodel.model2.register;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.util.HashMap;</span><br><span class="line"><span class="keyword">import</span> java.util.Map;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@ClassName</span>: RegisterFormBean</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span>: 效验注册表单信息</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: HuangYuhui</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: May 5, 2019 4:37:33 PM</span></span><br><span class="line"><span class="comment"> * </span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">RegisterFormBean</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">private</span> String name;</span><br><span class="line">	<span class="keyword">private</span> String password;</span><br><span class="line">	<span class="keyword">private</span> String password2;</span><br><span class="line">	<span class="keyword">private</span> String email;</span><br><span class="line"></span><br><span class="line">	<span class="comment">// 存储验证表单时发生的错误信息</span></span><br><span class="line">	<span class="keyword">private</span> Map&lt;String, String&gt; errors = <span class="keyword">new</span> HashMap&lt;String, String&gt;();</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="title">RegisterFormBean</span><span class="params">(String name, String password, String password2, String email)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">super</span>();</span><br><span class="line">		<span class="keyword">this</span>.name = name;</span><br><span class="line">		<span class="keyword">this</span>.password = password;</span><br><span class="line">		<span class="keyword">this</span>.password2 = password2;</span><br><span class="line">		<span class="keyword">this</span>.email = email;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">getName</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> name;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setName</span><span class="params">(String name)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.name = name;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">getPassword</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> password;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setPassword</span><span class="params">(String password)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.password = password;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">getPassword2</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> password2;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setPassword2</span><span class="params">(String password2)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.password2 = password2;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> String <span class="title">getEmail</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> email;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setEmail</span><span class="params">(String email)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">this</span>.email = email;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="comment">// 获取注册信息效验时发生的错误信息</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> Map&lt;String, String&gt; <span class="title">getErrors</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> errors;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="comment">// 添加注册信息效验时发生的错误信息</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setErrorsMsg</span><span class="params">(String error, String errorMsg)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">if</span> ((error) != <span class="keyword">null</span> &amp;&amp; (errorMsg != <span class="keyword">null</span>)) &#123;</span><br><span class="line">			errors.put(error, errorMsg);</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="comment">// 校验用户注册信息</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">validate</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">boolean</span> flag = <span class="keyword">true</span>;</span><br><span class="line"></span><br><span class="line">		<span class="keyword">if</span> (name == <span class="keyword">null</span> || name.trim().equals(<span class="string">""</span>)) &#123;</span><br><span class="line">			errors.put(<span class="string">"nameErrorInfo"</span>, <span class="string">"请输入用户名 !"</span>);</span><br><span class="line">			flag = <span class="keyword">false</span>;</span><br><span class="line">		&#125;</span><br><span class="line"></span><br><span class="line">		<span class="keyword">if</span> (password == <span class="keyword">null</span> || password.trim().equals(<span class="string">""</span>)) &#123;</span><br><span class="line">			errors.put(<span class="string">"passwordErrorInfo"</span>, <span class="string">"请输入密码 !"</span>);</span><br><span class="line">			flag = <span class="keyword">false</span>;</span><br><span class="line">		&#125; <span class="keyword">else</span> <span class="keyword">if</span> (password.length() &gt; <span class="number">16</span> || password.length() &lt; <span class="number">6</span>) &#123;</span><br><span class="line">			errors.put(<span class="string">"passwordErrorInfo"</span>, <span class="string">"请输入6-12位的密码 !"</span>);</span><br><span class="line">			flag = <span class="keyword">false</span>;</span><br><span class="line">		&#125;</span><br><span class="line"></span><br><span class="line">		<span class="keyword">if</span> (password != <span class="keyword">null</span> &amp;&amp; !password.equals(password2)) &#123;</span><br><span class="line">			errors.put(<span class="string">"password2ErrorInfo"</span>, <span class="string">"两次输入的密码不相同 !"</span>);</span><br><span class="line">			flag = <span class="keyword">false</span>;</span><br><span class="line">		&#125;</span><br><span class="line"></span><br><span class="line">		<span class="keyword">if</span> (email == <span class="keyword">null</span> || email.trim().equals(<span class="string">""</span>)) &#123;</span><br><span class="line">			errors.put(<span class="string">"emailErrorInfo"</span>, <span class="string">"请输入邮箱地址 !"</span>);</span><br><span class="line">			flag = <span class="keyword">false</span>;</span><br><span class="line">		&#125; <span class="keyword">else</span> <span class="keyword">if</span> (!email.matches(<span class="string">"[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\\.[a-zA-Z0-9_-]+)+"</span>)) &#123;</span><br><span class="line">			errors.put(<span class="string">"emailErrorInfo"</span>, <span class="string">"邮箱地址格式错误 !"</span>);</span><br><span class="line">			flag = <span class="keyword">false</span>;</span><br><span class="line">		&#125;</span><br><span class="line"></span><br><span class="line">		<span class="keyword">return</span> flag;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>DBUtil.java : 访问数据库的辅助类,充当DAO.</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.jspmodel.model2.register;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.util.HashMap;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@ClassName</span>: DBUtil</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span>: 模拟数据库,充当DAO</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: HuangYuhui</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: May 5, 2019 4:50:10 PM</span></span><br><span class="line"><span class="comment"> * </span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">DBUtil</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">private</span> <span class="keyword">static</span> DBUtil instance = <span class="keyword">new</span> DBUtil();</span><br><span class="line">	<span class="keyword">private</span> HashMap&lt;String, UserBean&gt; users = <span class="keyword">new</span> HashMap&lt;String, UserBean&gt;();</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">private</span> <span class="title">DBUtil</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="comment">// 向数据库中添加一条用户数据</span></span><br><span class="line">		UserBean firstUser = <span class="keyword">new</span> UserBean(<span class="string">"YUbuntu0109"</span>, <span class="string">"myPassword"</span>, <span class="string">"Gentleman_0109@outlook.com"</span>);</span><br><span class="line">		users.put(<span class="string">"YUbuntu0109"</span>, firstUser);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">static</span> DBUtil <span class="title">getInstance</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">return</span> instance;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="comment">// 获取数据库中指定用户名的数据</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> UserBean <span class="title">getUser</span><span class="params">(String userName)</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">		UserBean user = users.get(userName);</span><br><span class="line">		<span class="keyword">return</span> user;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="comment">// 向数据库中添加新的用户数据</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">insertUser</span><span class="params">(UserBean user)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">if</span> (user == <span class="keyword">null</span>) &#123;</span><br><span class="line">			<span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line">		&#125;</span><br><span class="line"></span><br><span class="line">		String userName = user.getName();</span><br><span class="line">		<span class="keyword">if</span> (users.get(userName) != <span class="keyword">null</span>) &#123;</span><br><span class="line">			<span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line">		&#125;</span><br><span class="line">		users.put(userName, user);</span><br><span class="line">		<span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>ControllerServlet.java : 控制器,负责处理用户注册的请求.</em></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> pers.huangyuhui.jspmodel.model2.register;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.io.IOException;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> javax.servlet.ServletException;</span><br><span class="line"><span class="keyword">import</span> javax.servlet.annotation.WebServlet;</span><br><span class="line"><span class="keyword">import</span> javax.servlet.http.HttpServlet;</span><br><span class="line"><span class="keyword">import</span> javax.servlet.http.HttpServletRequest;</span><br><span class="line"><span class="keyword">import</span> javax.servlet.http.HttpServletResponse;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@ClassName</span>: ColltrollerServlet</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@Description</span>: 处理用户注册请求</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span>: HuangYuhui</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span>: May 5, 2019 5:01:46 PM</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@WebServlet</span>(<span class="string">"/ControllerServlet"</span>)</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">ControllerServlet</span> <span class="keyword">extends</span> <span class="title">HttpServlet</span> </span>&#123;</span><br><span class="line">	<span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">long</span> serialVersionUID = <span class="number">1L</span>;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="title">ControllerServlet</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="keyword">super</span>();</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">doGet</span><span class="params">(HttpServletRequest request, HttpServletResponse response)</span></span></span><br><span class="line"><span class="function">			<span class="keyword">throws</span> ServletException, IOException </span>&#123;</span><br><span class="line"></span><br><span class="line">		request.setCharacterEncoding(<span class="string">"utf-8"</span>);</span><br><span class="line">		response.setContentType(<span class="string">"text/html;charset=utf-8"</span>);</span><br><span class="line"></span><br><span class="line">		String name = request.getParameter(<span class="string">"userName"</span>);</span><br><span class="line">		String password = request.getParameter(<span class="string">"userPassword"</span>);</span><br><span class="line">		String password2 = request.getParameter(<span class="string">"userPassword2"</span>);</span><br><span class="line">		String email = request.getParameter(<span class="string">"userEmail"</span>);</span><br><span class="line"></span><br><span class="line">		<span class="comment">// 效验用户提交的注册表单信息</span></span><br><span class="line">		RegisterFormBean registerFormBean = <span class="keyword">new</span> RegisterFormBean(name, password, password2, email);</span><br><span class="line">		<span class="keyword">if</span> (!registerFormBean.validate()) &#123;</span><br><span class="line">			request.setAttribute(<span class="string">"registerFromBean"</span>, registerFormBean);</span><br><span class="line">			request.getRequestDispatcher(<span class="string">"/register.jsp"</span>).forward(request, response);</span><br><span class="line">			<span class="keyword">return</span>;</span><br><span class="line">		&#125;</span><br><span class="line"></span><br><span class="line">		<span class="comment">// 存储用户注册信息</span></span><br><span class="line">		UserBean userBean = <span class="keyword">new</span> UserBean(name, password2, email);</span><br><span class="line">		<span class="keyword">if</span> (!DBUtil.getInstance().insertUser(userBean)) &#123;</span><br><span class="line">			request.setAttribute(<span class="string">"BDUtilErrorInfo"</span>, <span class="string">"抱歉! 你注册的用户名已存在啦 !"</span>);</span><br><span class="line">			request.setAttribute(<span class="string">"registerFromBean"</span>, registerFormBean);</span><br><span class="line">			request.getRequestDispatcher(<span class="string">"/register.jsp"</span>).forward(request, response);</span><br><span class="line">			<span class="keyword">return</span>;</span><br><span class="line">		&#125;</span><br><span class="line"></span><br><span class="line">		request.getSession().setAttribute(<span class="string">"userBean"</span>, userBean);</span><br><span class="line">		response.getWriter().print(<span class="string">"注册成功啦 ! 三秒后将自动跳转到用户注册信息的页面  !"</span>);</span><br><span class="line">		response.setHeader(<span class="string">"refresh"</span>, <span class="string">"3;url=registerInfo.jsp"</span>);</span><br><span class="line"></span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">doPost</span><span class="params">(HttpServletRequest request, HttpServletResponse response)</span></span></span><br><span class="line"><span class="function">			<span class="keyword">throws</span> ServletException, IOException </span>&#123;</span><br><span class="line">		doGet(request, response);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p><em>register.jsp : 用户注册页面.</em></p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">%@</span> <span class="attr">page</span> <span class="attr">language</span>=<span class="string">"java"</span> <span class="attr">contentType</span>=<span class="string">"text/html; charset=UTF-8"</span> <span class="attr">pageEncoding</span>=<span class="string">"UTF-8"</span>%&gt;</span></span><br><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"UTF-8"</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">title</span>&gt;</span>JSP Model 2<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">style</span> <span class="attr">type</span>=<span class="string">"text/css"</span>&gt;</span></span><br><span class="line">			h3&#123;</span><br><span class="line"><span class="css">				<span class="selector-tag">text-align</span><span class="selector-pseudo">:center</span>;</span></span><br><span class="line">			&#125;</span><br><span class="line"><span class="css">			<span class="selector-id">#main</span>&#123;</span></span><br><span class="line"><span class="css">				<span class="selector-tag">width</span><span class="selector-pseudo">:600px</span>;</span></span><br><span class="line">				margin-left: 450px;</span><br><span class="line">			&#125;</span><br><span class="line"><span class="css">			<span class="selector-id">#main</span> <span class="selector-tag">tr</span>&#123;</span></span><br><span class="line"><span class="css">				<span class="selector-tag">height</span><span class="selector-pseudo">:40px</span>;</span></span><br><span class="line">			&#125;</span><br><span class="line"><span class="css">			<span class="selector-id">#main</span> <span class="selector-tag">tr</span> <span class="selector-tag">td</span>&#123;</span></span><br><span class="line">				width: 50px;</span><br><span class="line">			&#125;</span><br><span class="line"><span class="css">			<span class="selector-id">#main</span> <span class="selector-tag">tr</span> <span class="selector-tag">td</span> <span class="selector-tag">input</span>&#123;</span></span><br><span class="line">				width: 200px;</span><br><span class="line">			&#125;</span><br><span class="line">			span&#123;</span><br><span class="line"><span class="css">				<span class="selector-tag">font-size</span><span class="selector-pseudo">:13px</span>;</span></span><br><span class="line"><span class="css">				<span class="selector-tag">color</span><span class="selector-pseudo">:red</span>;</span></span><br><span class="line">			&#125;</span><br><span class="line"><span class="css">			<span class="selector-class">.buttom</span> &#123;</span></span><br><span class="line">				text-align: center;</span><br><span class="line">				padding-top: 25px;</span><br><span class="line">			&#125;</span><br><span class="line"><span class="css">			<span class="selector-class">.buttom</span> <span class="selector-class">.register</span>&#123;</span></span><br><span class="line">				margin-right: 70px;</span><br><span class="line">			&#125;</span><br><span class="line">		<span class="tag">&lt;/<span class="name">style</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">h3</span>&gt;</span>用户注册页面<span class="tag">&lt;/<span class="name">h3</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">hr</span>/&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">form</span> <span class="attr">action</span>=<span class="string">"ControllerServlet"</span> <span class="attr">method</span>=<span class="string">"post"</span>&gt;</span></span><br><span class="line">				<span class="tag">&lt;<span class="name">table</span> <span class="attr">id</span>=<span class="string">"main"</span>&gt;</span></span><br><span class="line">					 <span class="tag">&lt;<span class="name">tr</span>&gt;</span></span><br><span class="line">					 	<span class="tag">&lt;<span class="name">td</span>&gt;</span>用户名<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">					 	<span class="tag">&lt;<span class="name">td</span>&gt;</span></span><br><span class="line">					 		<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">name</span>=<span class="string">"userName"</span> <span class="attr">value</span>=<span class="string">"$&#123;registerFromBean.name &#125;"</span>/&gt;</span></span><br><span class="line">					 		<span class="tag">&lt;<span class="name">span</span>&gt;</span></span><br><span class="line">					 			$&#123;registerFromBean.errors.nameErrorInfo &#125;</span><br><span class="line">					 			$&#123;BDUtilErrorInfo &#125;</span><br><span class="line">					 		<span class="tag">&lt;/<span class="name">span</span>&gt;</span></span><br><span class="line">					 	<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">					 <span class="tag">&lt;/<span class="name">tr</span>&gt;</span></span><br><span class="line">					 <span class="tag">&lt;<span class="name">tr</span>&gt;</span></span><br><span class="line">					 	<span class="tag">&lt;<span class="name">td</span>&gt;</span>密码<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">					 	<span class="tag">&lt;<span class="name">td</span>&gt;</span></span><br><span class="line">					 		<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"password"</span> <span class="attr">name</span>=<span class="string">"userPassword"</span> /&gt;</span></span><br><span class="line">					 		<span class="tag">&lt;<span class="name">span</span>&gt;</span></span><br><span class="line">								$&#123;registerFromBean.errors.passwordErrorInfo &#125;</span><br><span class="line">					 		<span class="tag">&lt;/<span class="name">span</span>&gt;</span></span><br><span class="line">					 	<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">					 <span class="tag">&lt;/<span class="name">tr</span>&gt;</span></span><br><span class="line">					 <span class="tag">&lt;<span class="name">tr</span>&gt;</span></span><br><span class="line">					 	<span class="tag">&lt;<span class="name">td</span>&gt;</span>确认密码<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">					 	<span class="tag">&lt;<span class="name">td</span>&gt;</span></span><br><span class="line">					 		<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"password"</span> <span class="attr">name</span>=<span class="string">"userPassword2"</span>/&gt;</span></span><br><span class="line">					 		<span class="tag">&lt;<span class="name">span</span>&gt;</span></span><br><span class="line">					 			$&#123;registerFromBean.errors.password2ErrorInfo &#125;</span><br><span class="line">					 		<span class="tag">&lt;/<span class="name">span</span>&gt;</span></span><br><span class="line">					 	<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">					 <span class="tag">&lt;/<span class="name">tr</span>&gt;</span></span><br><span class="line">					 <span class="tag">&lt;<span class="name">tr</span>&gt;</span></span><br><span class="line">					 	<span class="tag">&lt;<span class="name">td</span>&gt;</span>邮箱<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">					 	<span class="tag">&lt;<span class="name">td</span>&gt;</span></span><br><span class="line">					 		<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">name</span>=<span class="string">"userEmail"</span> <span class="attr">value</span>=<span class="string">"$&#123;registerFromBean.email &#125;"</span>/&gt;</span></span><br><span class="line">					 		<span class="tag">&lt;<span class="name">span</span>&gt;</span></span><br><span class="line">					 			$&#123;registerFromBean.errors.emailErrorInfo &#125;</span><br><span class="line">					 		<span class="tag">&lt;/<span class="name">span</span>&gt;</span></span><br><span class="line">					 	<span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">					 <span class="tag">&lt;/<span class="name">tr</span>&gt;</span></span><br><span class="line">				<span class="tag">&lt;/<span class="name">table</span>&gt;</span></span><br><span class="line">				<span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">"buttom"</span>&gt;</span></span><br><span class="line">					<span class="tag">&lt;<span class="name">input</span> <span class="attr">class</span>=<span class="string">"register"</span> <span class="attr">type</span>=<span class="string">"submit"</span> <span class="attr">value</span>=<span class="string">"注册"</span>/&gt;</span></span><br><span class="line">					<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"reset"</span> <span class="attr">value</span>=<span class="string">"重置"</span>/&gt;</span></span><br><span class="line">				<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">			<span class="tag">&lt;/<span class="name">form</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>registerInfo.jsp : 用户注册成功页面.</em></p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">%@</span> <span class="attr">page</span> <span class="attr">language</span>=<span class="string">"java"</span> <span class="attr">contentType</span>=<span class="string">"text/html; charset=UTF-8"</span> <span class="attr">pageEncoding</span>=<span class="string">"UTF-8"</span>%&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">%@taglib</span> <span class="attr">prefix</span>=<span class="string">"c"</span> <span class="attr">uri</span>=<span class="string">"http://java.sun.com/jsp/jstl/core"</span>%&gt;</span></span><br><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"UTF-8"</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">title</span>&gt;</span>JSP Model 2<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">h3</span> <span class="attr">align</span>=<span class="string">"center"</span>&gt;</span>JSP Mode2 : 用户注册信息<span class="tag">&lt;/<span class="name">h3</span>&gt;</span></span><br><span class="line">		<span class="tag">&lt;<span class="name">hr</span>/&gt;</span></span><br><span class="line">			<span class="tag">&lt;<span class="name">c:choose</span>&gt;</span></span><br><span class="line">				<span class="tag">&lt;<span class="name">c:when</span> <span class="attr">test</span>=<span class="string">"$&#123;sessionScope.userBean == null  &#125;"</span>&gt;</span></span><br><span class="line">					<span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">"$&#123;pageContext.request.contextPath &#125;/register.jsp"</span>&gt;</span>你还未注册! 请注册哟ヾ(●´∀｀●) ~<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br><span class="line">				<span class="tag">&lt;/<span class="name">c:when</span>&gt;</span>			</span><br><span class="line">				<span class="tag">&lt;<span class="name">c:otherwise</span>&gt;</span></span><br><span class="line">					<span class="tag">&lt;<span class="name">div</span> <span class="attr">align</span>=<span class="string">"center"</span>&gt;</span></span><br><span class="line">						<span class="tag">&lt;<span class="name">p</span>&gt;</span>你的姓名: $&#123;sessionScope.userBean.name &#125;<span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line">						<span class="tag">&lt;<span class="name">p</span>&gt;</span>你的邮箱: $&#123;sessionScope.userBean.email &#125;<span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line">					<span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">				<span class="tag">&lt;/<span class="name">c:otherwise</span>&gt;</span></span><br><span class="line">			<span class="tag">&lt;/<span class="name">c:choose</span>&gt;</span></span><br><span class="line">	<span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
</li>
<li><p><em>程序运行效果示例图.</em></p>
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                    <img src="/2019/05/05/Java-web-JSP-Model/JSPModel2案例-用户注册页面.PNG" alt title>
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                    <img src="/2019/05/05/Java-web-JSP-Model/JSPModel2案例-用户注册信息页面.PNG" alt title>
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                <div class="image-caption"></div>
            </figure></li>
</ol>

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